EP0672560A2 - Extruded generant and combined reaction can and inflator - Google Patents

Extruded generant and combined reaction can and inflator Download PDF

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Publication number
EP0672560A2
EP0672560A2 EP95301466A EP95301466A EP0672560A2 EP 0672560 A2 EP0672560 A2 EP 0672560A2 EP 95301466 A EP95301466 A EP 95301466A EP 95301466 A EP95301466 A EP 95301466A EP 0672560 A2 EP0672560 A2 EP 0672560A2
Authority
EP
European Patent Office
Prior art keywords
gas generant
generant
extruded
gas
restraint system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95301466A
Other languages
German (de)
French (fr)
Other versions
EP0672560B1 (en
EP0672560A3 (en
Inventor
Donald R. Lauritzen
David J. Green
Larry D. Rose
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Autoliv ASP Inc
Original Assignee
Morton International LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Morton International LLC filed Critical Morton International LLC
Publication of EP0672560A2 publication Critical patent/EP0672560A2/en
Publication of EP0672560A3 publication Critical patent/EP0672560A3/en
Application granted granted Critical
Publication of EP0672560B1 publication Critical patent/EP0672560B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
    • B60R21/217—Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together
    • B60R21/2171—Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together specially adapted for elongated cylindrical or bottle-like inflators with a symmetry axis perpendicular to the main direction of bag deployment, e.g. extruded reaction canisters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/264—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic
    • B60R21/2644—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous generation of gas, e.g. pyrotechnic using only solid reacting substances, e.g. pellets, powder
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C9/00—Chemical contact igniters; Chemical lighters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/04—Blasting cartridges, i.e. case and explosive for producing gas under pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R2021/26029—Ignitors
    • B60R2021/26041—Ignitors of elongated shape

Definitions

  • This invention relates to motor vehicle airbag restraint systems.
  • a motor vehicle airbag system customarily includes a trough-shaped reaction canister closed at its ends by endplates.
  • An inflator is mounted within the reaction canister.
  • the inflator normally comprises a cylindrical ignition can having gas ports through its wall. The ignition can encloses a gas generant surrounded by a filtration medium.
  • a folded airbag is enclosed within the reaction canister with its mouth arranged to receive the gases from the generant when activated by a crash sensor.
  • inflators include generants that burn from the center outward. They might be, for example, in the form of stacked washer-like wafers having an igniter passing through the central hole. Alternatively, the generant might be in the form of pellets surrounding the igniter. Upon ignition, the gases which are produced exit through gaps between the wafers, through spaces around the pellets, or through gaps between generant sections. These arrangements have worked well in practice. However, the number of individual pieces, both of the generant and the reaction canister, have required expensive fabrication machinery and an undesirable amount of handling and assembly. As a result, the inflator has become the most expensive part of the airbag module. Accordingly it is a primary object of the present invention to provide an airbag module wherein the number of parts is substantially reduced. Another object is to substantially reduce the amount of labor required to assemble such a module. Other objects, features and advantages will become apparent from the following description and appended claims.
  • the trough-like main body of a reaction canister and an inflator housing are extruded in one piece. Both the generant charge and the igniter strips are also extruded.
  • the main generant charge may extend the full length of the canister or may be assembled with one or more inert sections to control the volume of gas produced.
  • FIG. 1 illustrates in exploded format the various elements which make up a passenger-side airbag module incorporating the present invention.
  • the main body is a reaction canister 10 which includes sidewalls 12 , 14 forming the sides of a trough.
  • the floor of the trough is formed by inwardly extending extensions 16 , 18 of the sidewalls. These sidewall extensions are integral with diametrically opposite sides of a cylindrical ignition can 20 .
  • the material employed may be, for example, aluminum.
  • the top surface of the ignition can 20 which lies within the trough is drilled or pierced to form a plurality of vent holes 22 .
  • the vent holes 22 permit gas from an activated generant within the ignition can 20 to enter the mouth of an airbag which is contained within the reaction can 10 .
  • the airbag itself does not form a part of this invention, it is not illustrated.
  • a hollow cylindrical filter 24 which may be formed, for example, of wire mesh.
  • a gas generant assembly 26 Enclosed within the cylindrical filter 24 is a gas generant assembly 26 .
  • the gas generant assembly comprises a cylindrical generant charge 28 which may be in one piece or in a plurality of pieces 28a , 28b , 28c as illustrated. Retained in cavities within the generant charge are a plurality of strip igniters 30 . Both the generant charge 28 and the strip igniters 30 may be extruded.
  • the reason for illustrating the generant charge 28 as a plurality of extrusions is to illustrate a "tuned" charge.
  • one section such as central portion 28b may be inert.
  • the volume of gases produced is reduced without the need for changing the size of the reaction canister.
  • the generant charge It is desirable for the generant charge to burn for a given period of time and then to burn out with little or no tail off. It is important, however, for the gases to move outwardly normal to the center of the charge, to the ports at the outer periphery of the ignition can 20 .
  • a variety of grain configurations may be employed which permit gases to exit through the outer surfaces of the generant charge. These configurations can also control the production of burned gas, which is desirable during the initial phase of the burn. It is most desirable to obtain low gas production during the first 15 milliseconds of burn followed by maximum gas production to burnout.
  • FIGS. 2A-2F Various configurations of gas generant cross-sections and strip igniters are illustrated in FIGS. 2A-2F . In each instance, the generally cylindrical generant 28 defines radial openings 32 of various shapes into which are keyed the correspondingly shaped strip igniters 30 .
  • the igniter strips 30 protrude past the generant charge 28 to surround an initiator 41 .
  • the protruding ends may be sensitized to aid ignition.
  • the initiator 41 will ignite the protruding igniter strips which will, in turn, ignite the generant.
  • the generant charge 28 is preloaded to provide cushioning against shock, vibration and thermal expansion. It will also take up any tolerance differences.
  • a preload assembly 34 is provided at one end of the generant charge 28 . It may comprise for example a unitary flat washer 36 and cup 38 with a finger spring washer 40 in between. Such an assembly is described in detail in US Patent Application 08/212258 of D.R. Lauritzen and J.L. Ralston which has been assigned to the proprietor of the present application. The disclosure of that application is incorporated herein by reference.
  • the opposite end of the generant charge 28 abuts a cup member 35 which includes barbs 37 which dig into the filter 24 .
  • the base of the cup member defines a central aperture 39 through which pass the ends of the strip igniters 30 .
  • the reaction canister is completed by endplates 42 , 44 at either end.
  • End bases 46 , 48 of the usual type have flat plates 50 which are screwed to the respective endplates and include cylindrical sockets 52 for receiving the ends of the gas generant assembly 26 and filter 24 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

Vehicle occupant restraint gas generant comprising three cylindrical extruded pieces (28A-C) with longitudinal grooves (32) extending radially inwardly from the surface of the pieces to a depth of at least half of the radius of the pieces and accommodating extruded igniter strips (30) configured so as to conform at least partially to inner surfaces of the grooves (32). The gas generant (28A-C) may be accommodated within a mesh filter cylinder (24) located within a perforated ignition can (20) which is connected by extensions (16, 18) to sidewalls (12, 14) of a reaction canister (10). The ignition can (20) is formed as a one-piece extrusion with the sidewalls (12, 14) and the extensions (16, 18).

Description

  • This invention relates to motor vehicle airbag restraint systems.
  • A motor vehicle airbag system, and in particular a passenger-side module, customarily includes a trough-shaped reaction canister closed at its ends by endplates. An inflator is mounted within the reaction canister. The inflator normally comprises a cylindrical ignition can having gas ports through its wall. The ignition can encloses a gas generant surrounded by a filtration medium. A folded airbag is enclosed within the reaction canister with its mouth arranged to receive the gases from the generant when activated by a crash sensor.
  • Most prior art inflators include generants that burn from the center outward. They might be, for example, in the form of stacked washer-like wafers having an igniter passing through the central hole. Alternatively, the generant might be in the form of pellets surrounding the igniter. Upon ignition, the gases which are produced exit through gaps between the wafers, through spaces around the pellets, or through gaps between generant sections. These arrangements have worked well in practice. However, the number of individual pieces, both of the generant and the reaction canister, have required expensive fabrication machinery and an undesirable amount of handling and assembly. As a result, the inflator has become the most expensive part of the airbag module. Accordingly it is a primary object of the present invention to provide an airbag module wherein the number of parts is substantially reduced. Another object is to substantially reduce the amount of labor required to assemble such a module. Other objects, features and advantages will become apparent from the following description and appended claims.
  • According to the invention the trough-like main body of a reaction canister and an inflator housing are extruded in one piece. Both the generant charge and the igniter strips are also extruded. The main generant charge may extend the full length of the canister or may be assembled with one or more inert sections to control the volume of gas produced.
  • The invention will now be described by way of example only with reference to the accompanying figures in which:
    • FIG. 1 is an exploded perspective view illustrating the various elements making up the airbag module of this invention;
    • FIGS. 2A - 2F illustrate various configurations of the extruded gas generant and igniter strips; and
    • FIG. 3 is a longitudinal cross-section through the assembled structure.
  • FIG. 1 illustrates in exploded format the various elements which make up a passenger-side airbag module incorporating the present invention. The main body is a reaction canister 10 which includes sidewalls 12, 14 forming the sides of a trough. The floor of the trough is formed by inwardly extending extensions 16, 18 of the sidewalls. These sidewall extensions are integral with diametrically opposite sides of a cylindrical ignition can 20. It is important to note that all of the foregoing elements of the reaction canister 10 are joined in a single member which is preferably extruded and cut to the desired length. The material employed may be, for example, aluminum. The top surface of the ignition can 20 which lies within the trough is drilled or pierced to form a plurality of vent holes 22. The vent holes 22 permit gas from an activated generant within the ignition can 20 to enter the mouth of an airbag which is contained within the reaction can 10. As the airbag itself does not form a part of this invention, it is not illustrated.
  • Housed within the ignition can 20 is a hollow cylindrical filter 24 which may be formed, for example, of wire mesh. Enclosed within the cylindrical filter 24 is a gas generant assembly 26. The gas generant assembly comprises a cylindrical generant charge 28 which may be in one piece or in a plurality of pieces 28a, 28b, 28c as illustrated. Retained in cavities within the generant charge are a plurality of strip igniters 30. Both the generant charge 28 and the strip igniters 30 may be extruded.
  • The reason for illustrating the generant charge 28 as a plurality of extrusions is to illustrate a "tuned" charge. In such a charge, one section such as central portion 28b may be inert. As a result, the volume of gases produced is reduced without the need for changing the size of the reaction canister.
  • It is desirable for the generant charge to burn for a given period of time and then to burn out with little or no tail off. It is important, however, for the gases to move outwardly normal to the center of the charge, to the ports at the outer periphery of the ignition can 20. To accomplish these objectives a variety of grain configurations may be employed which permit gases to exit through the outer surfaces of the generant charge. These configurations can also control the production of burned gas, which is desirable during the initial phase of the burn. It is most desirable to obtain low gas production during the first 15 milliseconds of burn followed by maximum gas production to burnout. Various configurations of gas generant cross-sections and strip igniters are illustrated in FIGS. 2A-2F. In each instance, the generally cylindrical generant 28 defines radial openings 32 of various shapes into which are keyed the correspondingly shaped strip igniters 30.
  • The igniter strips 30 protrude past the generant charge 28 to surround an initiator 41. The protruding ends may be sensitized to aid ignition. The initiator 41 will ignite the protruding igniter strips which will, in turn, ignite the generant.
  • The generant charge 28 is preloaded to provide cushioning against shock, vibration and thermal expansion. It will also take up any tolerance differences. A preload assembly 34 is provided at one end of the generant charge 28. It may comprise for example a unitary flat washer 36 and cup 38 with a finger spring washer 40 in between. Such an assembly is described in detail in US Patent Application 08/212258 of D.R. Lauritzen and J.L. Ralston which has been assigned to the proprietor of the present application. The disclosure of that application is incorporated herein by reference.
  • The opposite end of the generant charge 28 abuts a cup member 35 which includes barbs 37 which dig into the filter 24. The base of the cup member defines a central aperture 39 through which pass the ends of the strip igniters 30.
  • The reaction canister is completed by endplates 42, 44 at either end. End bases 46, 48 of the usual type have flat plates 50 which are screwed to the respective endplates and include cylindrical sockets 52 for receiving the ends of the gas generant assembly 26 and filter 24.

Claims (10)

  1. A vehicle occupant restraint system including a trough-shaped main body having first and second ends, first and second end plates (42, 44) attached to said main body to form a reaction canister (10), an ignition chamber (20) in gas flow communication with the interior of said canister (10), said reaction canister being adapted to enclose an airbag to be filled with gas from gas generant positionable within said ignition chamber (20) upon ignition, and means for igniting the gas generant, wherein said reaction canister main body and said ignition chamber (20) are a one piece unit.
  2. The restraint system of claim 1 wherein said main body and ignition chamber (20) are extruded as a single member.
  3. The restraint system of claim 1 or 2, including gas generant (28) within said ignition chamber (20).
  4. Vehicle occupant restraint system gas generant (28) comprising an extruded, elongated member having a substantially cylindrical surface and a substantially circular cross section partially subdivided by radial grooves (32) extending along its length.
  5. The gas generant of claim 4 wherein the grooves extend to a depth of at least half the radius of said circular cross section.
  6. The gas generant (28) of claim 4 or 5 wherein said elongated member is substantially cylindrical and said grooves (32) extend inwardly from said cylindrical surface and terminate at a depth less than the radius of said cylinder.
  7. The gas generant of any one of claims 4 to 6 including igniter strips (30) enclosed within a plurality of said radial grooves (32).
  8. The gas generant of claim 7 wherein each of said igniter strips (30) has a cross-sectional shape substantially conforming to the shape of its associated groove (32).
  9. The gas generant of claim 7 or 8 wherein said igniter strips (30) are extruded.
  10. The restraint system of claim 3 wherein the gas generant (28) is as claimed in any one of claims 4 to 9.
EP95301466A 1994-03-14 1995-03-07 Extruded generant Expired - Lifetime EP0672560B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US213176 1994-03-14
US08/213,176 US5441705A (en) 1994-03-14 1994-03-14 Combined reaction can and inflator with extruded generant

Publications (3)

Publication Number Publication Date
EP0672560A2 true EP0672560A2 (en) 1995-09-20
EP0672560A3 EP0672560A3 (en) 1995-11-22
EP0672560B1 EP0672560B1 (en) 1998-07-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95301466A Expired - Lifetime EP0672560B1 (en) 1994-03-14 1995-03-07 Extruded generant

Country Status (8)

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US (2) US5441705A (en)
EP (1) EP0672560B1 (en)
JP (1) JP2614429B2 (en)
KR (2) KR950026741A (en)
CN (1) CN2234384Y (en)
AU (1) AU665723B2 (en)
CA (1) CA2140946A1 (en)
DE (1) DE69503677T2 (en)

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Also Published As

Publication number Publication date
EP0672560B1 (en) 1998-07-29
DE69503677D1 (en) 1998-09-03
JPH07257312A (en) 1995-10-09
EP0672560A3 (en) 1995-11-22
CN2234384Y (en) 1996-09-04
AU665723B2 (en) 1996-01-11
AU1009095A (en) 1995-09-21
US5387009A (en) 1995-02-07
KR950026740A (en) 1995-10-16
CA2140946A1 (en) 1995-09-15
DE69503677T2 (en) 1999-02-25
JP2614429B2 (en) 1997-05-28
US5441705A (en) 1995-08-15
KR950026741A (en) 1995-10-16

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